U.S. National Security Agency, Center for Cryptologic History, (order the publication for free) « Eavesdropping on Hell: Historical Guide to Western Communications Intelligence and the Holocaust, 1939-1945. » (NSA, 2005)

Yanel, Leni, « Raoul Wallenberg – his mission and his activities in Hungary », appeared in The Nazi HOLOCAUST, historical articles on the destruction of European Jews, volume 9. The End of the Holocaust. ISBN 0-88736-265-6